The Calculations And Analysis Of Magnetic-thermal-stress For Oilfield Induction Motor

With the continuous development of petroleum industry,pumping units are widely used as oil pumping equipment used in oilfields.During the process of petroleum exploitation,the electric motors need large starting torque,and usually choose highpower motors to match with induction motors for pumping units Output higher starting torque requirements,resulting in the normal operation of the motor will appear when the high-power motor drives a lower load,greatly reducing the efficiency of the motor,resulting in unnecessary waste of energy.Based on this problem,this paper optimizes the design of Y2-200L2-6 induction motor for oil field,and studies the improved twodimensional electromagnetic field,three-dimensional transient temperature field and rotor thermal stress field to verify the reliability of optimized induction motor for oilfield And applicability.Based on the Y2-200L2-6 motor,the internal structure of the motor is optimized.The arrangement of the windings is changed and the core is lengthened.Twodimensional electromagnetic model of the motor is established.By using the finite element method,the magnetic density distribution of the motor under rated conditions is calculated.Prototype test and simulation calculation of the stator current to understand the electromagnetic performance of the motor,and to solve the motor loss data of various parts,get the motor heat source distribution,to provide a basis for the accurate calculation of the temperature field.Based on the calculation results of two-dimensional electromagnetic field,the threedimensional temperature field model of the motor is established.The threedimensional transient temperature field is solved by the loss density of each unit in the motor.The reasonable basic assumption of the temperature field of the motor is made.Corresponding boundary conditions And the surface of the heat dissipation coefficient.The finite element method is used to analyze the three-dimensional transient temperature field of the improved motor.The simulation results are compared with the prototype test results to verify the accuracy of the finite element simulation method.Finally,according to the temperature distribution of the rotor calculated by the threedimensional transient temperature field of the motor,the transient thermal stress and thermal deformation of the rotor of the motor are solved,and the stress range and deformation of the rotor can be analyzed.Occurrence of fracture fault prediction,verify the reliability of the motor operation and stability.